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Old 02-05-2008, 02:39 PM
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a/c blows no matter how i turn the knob

hey guys long time no see,

i have a stupid question that i'm pretty sure i might have figured out but i'm not sure, so i figured i'd run it by you guys to make sure.

i now have a 99 yukon (older body style not the rounded one) and the blower blows regardless if it's on the "off" position or not. it has 4 speeds, but theres not much of a difference between "off" and "low" range. for the record it does it weather if it's on cool or heat also which lead me to conclude the blower is blowing regardless.

i think it might be the switch or whatever it is that my knob is connected to to turn it on and off. or is it suppose to blow a little to keep the air circulating since it's so big on the inside? i just don't think thats right....will someone correct me if i'm wrong.

thanks,

-J

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Old 02-05-2008, 03:20 PM
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Hi, if you take the fuse out, is it still blowing out air?

I would put a test light on the relay under the hood on top of the condenser box, and if you unplug the relay, and have the switch off, there should be 0 power on the relay.

Try that, and let me know what happens.

Brian.
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Old 02-05-2008, 05:36 PM
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73-87 Chevy pickups had this same issue,I guess the engineers thought that the fan needed to run ALL THE TIME.That is one of very few things that I dont like about theses trucks.


Shane
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Old 02-05-2008, 06:41 PM
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thanks chevelle, i'll try that and get back to ya.

chevrolet4x4, see i could see if it was that outside air blowing in for air circulation, but it's cold so i know it's the a/c air flowing thru there and i don't like that b/c i don't need the a/c ALL the time.

don't these people know gas is $3 a gal. anymore....geeze! it's one big conspiracy i tell ya, i think the oil companys are paying the manufactures to do this crap anymore

thanks for advice tho, i'll get back to you guys shortly
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Old 02-06-2008, 05:30 AM
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Hi: I'm going to move this thread to General Rodding Tech. You'll get more and better answers there.

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Old 02-07-2008, 08:54 PM
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It's common in cars less than 35 years old or so. I've heard two explanations:

1. It's to keep the A/C from freezing up due to lack of air flow.

2. It's so the blower motor will die quicker and when you find out how much it costs to fix it since it's buried so deep under the dash, you'll buy a new car from them.
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Old 02-08-2008, 05:11 PM
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by cooling the air before it's heated, you decrease the chance of fog on the inside of the windows.
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Old 02-08-2008, 09:54 PM
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Quote:
Originally Posted by matt167
by cooling the air before it's heated, you decrease the chance of fog on the inside of the windows.
Seriously?????


Shane
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Old 02-08-2008, 11:12 PM
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Quote:
Originally Posted by Chevrolet4x4s
Seriously?????


Shane
Yes!!!!! It helps to defrost the windows! The A/C has been used for the last 10 years world wide to help keeping the windshield's from fogging up. All of the vehicles with automatic temperature control, automatically adjust the vents to mix A/C with Heat.
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